详情

2260 - Shrinkage Induced Deformation in Steel Bridges Made Composite with Concrete Deck Slabs - Phase 3

项目名称：	2260 - Shrinkage Induced Deformation in Steel Bridges Made Composite with Concrete Deck Slabs - Phase 3
摘要：	Concrete bridge decks are typically cast upon steel or precast concrete girders. The new concrete begins to change volume which can be caused by increased or decreased temperature, and by the natural drying shrinkage of concrete. It has been suggested that the excessive deflections are caused by drying shrinkage of concrete. Newly cast concrete will shrink. When new concrete is cast atop steel girders, the shrinkage of the concrete can cause the composite beam to deflect downward. These downward deflections were attributed, in part, to concrete shrinkage. However, shrinkage is only one consideration. Other considerations can include errors in design, errors in the computation of estimated deflections, or unexpected deformations of the forms, framing systems and/or screed rails that support the bridge decks during casting. All of these factors and perhaps more should be considered in a complete and thorough investigation. This research will investigate bridges constructed in Oklahoma where concrete decks are cast atop steel girders. The research team will specifically look at bridges that have experienced problems with excessive deflection and/or poor ride quality. The proposed research will investigate the shrinkage characteristics of concrete, examine analytically the likely effects of shrinkage on composite steel girder bridges, examine experimentally the system of concrete and steel bridge beams, perform field investigations of existing bridges, and develop rationale for the cause of excessive deflections. The work plan will provide reasonable and practical solutions that can help to mitigate excessive deflections and poor ride quality.
状态：	Active
资金：	89,000.00
资助组织：	Oklahoma Department of Transportation
项目负责人：	Peters, Walt
执行机构：	Oklahoma State University, Stillwater
主要研究人员：	Russell, Bruce W
开始时间：	20151001
预计完成日期：	20200930
实际结束时间：	0